Lifting-jack.



R. W. DUDDING.

LIFTING JACK.

` APPLICATION F1151) 1uLY 29. 1914.

Patented Nov. 2, 1915.

0 f: f g 0 1 /f f T? i d E 9 /7 4 /4 E- 'j /7 /j 1 /3 IFF RALPH w. DUDDING, or MINNEAPOLIS, MINNESOTA.

LIFTING-J ACK.

Application filed July 29, 1914.V Serial No. 853,828.

Toal whom t may concern.' y

Be it known that I, RALPH W., DUDDING, citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, havevinvented certain new and useful Improvements in Lifting- Jacks; and I doliereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its obj ect to provide a lifting jack, by means of which a load may be raised and lowered vertically, and caused to travellaterally simultaneously with` said vertical movement. Y

To the above ends, generally stated, the invention consists of the novel devices and ,combinations of devices hereinafter decipally in side elevation, with some partsV sectioned on the line m1 w1 of Fig. 4. Fig. 2 is a plan view of the improved lifting jack; Fig. 3 is a longitudinal vertical section, taken onthe line rims of Fig. 2; Fig. 4 is a left hand end elevation of theimproved lifting jack, with respect to Fig. 3; and Fig. 5 is a right hand end elevation of the improved lifting jack, witlrrespect to Fig. 3.

The numeral 1 indicates a base casting having integrally formed therewith a pair' of laterally spaced skeleton side flanges 2. Mounted between theside ianges 2, for independent oscillatory movement, are a lifting segment 3 and a lowering segment 4. These segments are journaled on a heavy bolt 5 anchored in the upper transverse p0rtions of the side flanges 2. lEach segment has formed in its periphery a double row of laterally spaced gear teeth 6. On the inner extremities of the segments 3 4, are pivotally .mounted shoes 7 and 8, respectively, for supporting the load. These shoes extend radially outward of the peripheries of the segments, and have their outer and upper portions roughened or serrated, to prevent the load from slipping thereon. As best shown in Fig. 2, the hub of the lowering segment 4 is bifurcated, and the hub of the lifting segment 3 works there-between.

The segment 3 is raised by a lever 9, and

Specification of Letters Patent.

Patented Nov. 2, 1915.

the segment 4 is lowered by a lever 10, said levers having sockets 11 adapted to receive and detachably hold a lever extension 12. These levers 9 and 10 are mounted between laterally spaced lugsl, integrally formed with the base 1 and fulcrumed on heavy pins 14, mounted in said lugs. Carried by each lever 9 and 10 is a pair of gravity held, upwardly projecting dogs 15 and16 respectively, arranged for cooperation with the teeth 6 of the respective segments 3 and 4. As best shown in Fig. 1, the lower ends of the dogs 15 and 16 are bifurcated and the prongs thereof embrace the respective levers 9 and 10 and are pivotally secured thereto by pins 17. The dogs of each pairare located on opposite sides of the respective fulcrum pins 14, so that when the levers 9 and 10 are 0perated,rone dog of each pair moves down, while the other moves up. Obviously, the upwardly moving dog 15 imparts a stepby step lifting movement to the segment 3.

To lower the shoe 8, it is necessary to alternately `render the dogs 16 inoperative. As shown, this is accomplished by a hand operated lever 18, having at its lower end a trieangula'r head 19, mounted between a pair of opposing leaf springs 20, anchored at their ends to the dogs 16. These springs 20, yieldingly hold the free end of the lever 18 at one ofits two extreme positions. The free end of the lever 18 is arranged to engage the intermediate portions of the dogs 16 and hold the engaged dog out of engagement with the teeth 6 of the segment 4.

Stops 21, on the side ianges 2 are provided to limit the outward swinging movement of the dog 16. Obviously, the downwardly moving dog carries the load, in lowering the shoe 8.

Integrally formed with each segment 3 and 4, is a pair of laterally and oppositely progecting stop lugs 22, arranged to engage stop shoulders 23 formed in the upper transverse portion of the side flanges 2, to limit the oscillatory movements of said segments toward each other, and to prevent the shoes 7 and 8 from passing from beyond dead centers.

From the foregoing description, it is evident that the load 7 may be lifted by the segment 3, and, at the same time, moved laterally. During this movement of the load, the shoe 7 may travel substantially 90 degrees. If it is desirable to further move the load laterally, the same may be transferred to the segment 4 and lowered thereby into substantially its originalhorizontal position. This segment. 4 may also move substantially 90 degrees. To transfer the load from the side shoe S, the segment 4 is moved upward, into engagement .with the load Z. The segment 3 is then lowered, to carry its shoe 7 out of engagement with the load and leave on the shoe S.

HWhat I claim is 1. A lifting jack having a pair of reversely acting lifting elements independently mounted for vertical and lateral movements, one of said lifting elements arranged to pick up the load and deliver the same on to the other of said lifting elements.

2. A lifting jack having a'pair of reversely acting lifting elements independently mounted for vertical and lateral movements, one of said lifting elements arranged to pick up the load and deliver the same on to the other of said lifting elements, and means for independently moving said elements.

3. A lifting jack, comprising a support, a lifting segment journaled on said support, a shoe pivoted to said segment, at the periphery thereof and engaged to be held by the load in a horizontal position above its pivotal support, and means for moving said segment.V Y Y 4. A lifting jack, comprising a support, a toothedY lifting segment journaled on said support, a load supporting element pivoted to said segment and a dog-equipped lever fulcrumed on said support and cooperating with the teeth of said segment for imparting the step by step movement thereto.

5.V A lifting jack, comprising a support Y, said support, a pair of opposing dogs carried by said lever and coperating with the teeth of said segment, and a stop limiting the oscillatory movement of said segment.

6. A lifting jack, comprising a support,

a lifting segment and a lowering segment journaled on'said support, for oscillatory movements, said lifting segment arranged to Pickup the load and deliver the same on to said lowering segment, .and means for independently moving said segments.

7. A lifting jack, comprisinga support,

a lifting segment and a lowering segment Journaled on said'support, for oscillatory movements, a shoe carried on the inner extremity of each of said segments, and means v for moving saidV segments, the shoe onV said lifting segment arranged to pick up the load and deliver the sameon'to said lowering segment.

f8. A lifting jack, comprising a support, a toothed lifting segment and a toothedV lowering segment ournaled on said su b .b 1 port, for independent oscillatory moveeoV ments, a shoe carried on the inner elftremityA of each of said segments, the shoe on said lifting segment arranged to pick up the load and deliver the -same on to said lowering ments, a shoe carried on the inner extremity` of each of said segments, the'shoe on said lifting segment arranged to pick up 'the load and deliver the same on to said lowering segment,dog-equipped levers fulcrumed on said support and Vcooperating with the' teeth of said segments, for independently Vmoving the same, and stops for limiting the oscillatory movements of said segments' toward each other.`

In testimony whereof IlV aifix my signature in presence of two-witnesses. Y

Witnesses:

EMILY MAY KING, p HARRY D. KILGoRn.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,Y

' Washington. D. C.

RALPH wpunnrNe. Y 

